Fault Activity’s Controlling Effect on Source Rock an Example from Bohai Sea Area

Abstract

Based on the fault activity, geochemical data and predecessor research results on tectonic subsidence and source rock of Bohai Sea Area, this paper took Bohai Sea Area as an example to compare its structural activity factors with its source rock indexes, and then to explore fault activity’s controlling effect on source rock. And the results shows: source rock thickness is mainly controlled by fault throw of boundary fault, but it is also be influenced by others factors in different stages; Fault activity rate, climatic conditions etc. factors are all key factors influencing organic matter percentage in source rock. And the key factors may change in different stages; Present organic matter maturities in different source rock are controlled by their present tectonic subsidence. And the bigger the tectonic subsidence, the higher the maturity; Source rock qualities on different structural belts are influenced by their distances away from the boundary fault, and the closer, the better. But quality on central uplift belt is worse than that on sub-sag belt flank.